Added the feature of Auto Commenting when a PR is merged

[suhanipaliwal]

Description

I have added auto-comment-on-pr-merge.yml in .github/workflows directory. This file will add the feature of auto commenting when a pr is merged.

Fixes #23

Type of change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update

Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• I have added tests that prove my fix is effective or that my feature works

[github-actions]

Welcome to Our repository.🎊 Thank you so much for taking the time to point this out.

[prathamjagga]

Merged. Thanks for the contribution @suhanipaliwal.